A formatter that formats dates to show the elapsed time relative to some base date.
/*
* JFreeChart : a free chart library for the Java(tm) platform
*
*
* (C) Copyright 2000-2008, by Object Refinery Limited and Contributors.
*
* Project Info: http://www.jfree.org/jfreechart/index.html
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* -----------------------
* RelativeDateFormat.java
* -----------------------
* (C) Copyright 2006-2008, by Object Refinery Limited and Contributors.
*
* Original Author: David Gilbert (for Object Refinery Limited);
* Contributor(s): Michael Siemer;
*
* Changes:
* --------
* 01-Nov-2006 : Version 1 (DG);
* 23-Nov-2006 : Added argument checks, updated equals(), added clone() and
* hashCode() (DG);
* 15-Feb-2008 : Applied patch 1873328 by Michael Siemer, with minor
* modifications (DG);
* 01-Sep-2008 : Added new fields for hour and minute formatting, based on
* patch 2033092 (DG);
*
*/
import java.text.DateFormat;
import java.text.DecimalFormat;
import java.text.FieldPosition;
import java.text.NumberFormat;
import java.text.ParsePosition;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
/**
* A formatter that formats dates to show the elapsed time relative to some
* base date.
*
* @since 1.0.3
*/
public class RelativeDateFormat extends DateFormat {
/** The base milliseconds for the elapsed time calculation. */
private long baseMillis;
/**
* A flag that controls whether or not a zero day count is displayed.
*/
private boolean showZeroDays;
/**
* A flag that controls whether or not a zero hour count is displayed.
*
* @since 1.0.10
*/
private boolean showZeroHours;
/**
* A formatter for the day count (most likely not critical until the
* day count exceeds 999).
*/
private NumberFormat dayFormatter;
/**
* A prefix prepended to the start of the format if the relative date is
* positive.
*
* @since 1.0.10
*/
private String positivePrefix;
/**
* A string appended after the day count.
*/
private String daySuffix;
/**
* A formatter for the hours.
*
* @since 1.0.11
*/
private NumberFormat hourFormatter;
/**
* A string appended after the hours.
*/
private String hourSuffix;
/**
* A formatter for the minutes.
*
* @since 1.0.11
*/
private NumberFormat minuteFormatter;
/**
* A string appended after the minutes.
*/
private String minuteSuffix;
/**
* A formatter for the seconds (and milliseconds).
*/
private NumberFormat secondFormatter;
/**
* A string appended after the seconds.
*/
private String secondSuffix;
/**
* A constant for the number of milliseconds in one hour.
*/
private static long MILLISECONDS_IN_ONE_HOUR = 60 * 60 * 1000L;
/**
* A constant for the number of milliseconds in one day.
*/
private static long MILLISECONDS_IN_ONE_DAY = 24 * MILLISECONDS_IN_ONE_HOUR;
/**
* Creates a new instance with base milliseconds set to zero.
*/
public RelativeDateFormat() {
this(0L);
}
/**
* Creates a new instance.
*
* @param time the date/time (<code>null</code> not permitted).
*/
public RelativeDateFormat(Date time) {
this(time.getTime());
}
/**
* Creates a new instance.
*
* @param baseMillis the time zone (<code>null</code> not permitted).
*/
public RelativeDateFormat(long baseMillis) {
super();
this.baseMillis = baseMillis;
this.showZeroDays = false;
this.showZeroHours = true;
this.positivePrefix = "";
this.dayFormatter = NumberFormat.getNumberInstance();
this.daySuffix = "d";
this.hourFormatter = NumberFormat.getNumberInstance();
this.hourSuffix = "h";
this.minuteFormatter = NumberFormat.getNumberInstance();
this.minuteSuffix = "m";
this.secondFormatter = NumberFormat.getNumberInstance();
this.secondFormatter.setMaximumFractionDigits(3);
this.secondFormatter.setMinimumFractionDigits(3);
this.secondSuffix = "s";
// we don't use the calendar or numberFormat fields, but equals(Object)
// is failing without them being non-null
this.calendar = new GregorianCalendar();
this.numberFormat = new DecimalFormat("0");
}
/**
* Returns the base date/time used to calculate the elapsed time for
* display.
*
* @return The base date/time in milliseconds since 1-Jan-1970.
*
* @see #setBaseMillis(long)
*/
public long getBaseMillis() {
return this.baseMillis;
}
/**
* Sets the base date/time used to calculate the elapsed time for display.
* This should be specified in milliseconds using the same encoding as
* <code>java.util.Date</code>.
*
* @param baseMillis the base date/time in milliseconds.
*
* @see #getBaseMillis()
*/
public void setBaseMillis(long baseMillis) {
this.baseMillis = baseMillis;
}
/**
* Returns the flag that controls whether or not zero day counts are
* shown in the formatted output.
*
* @return The flag.
*
* @see #setShowZeroDays(boolean)
*/
public boolean getShowZeroDays() {
return this.showZeroDays;
}
/**
* Sets the flag that controls whether or not zero day counts are shown
* in the formatted output.
*
* @param show the flag.
*
* @see #getShowZeroDays()
*/
public void setShowZeroDays(boolean show) {
this.showZeroDays = show;
}
/**
* Returns the flag that controls whether or not zero hour counts are
* shown in the formatted output.
*
* @return The flag.
*
* @see #setShowZeroHours(boolean)
*
* @since 1.0.10
*/
public boolean getShowZeroHours() {
return this.showZeroHours;
}
/**
* Sets the flag that controls whether or not zero hour counts are shown
* in the formatted output.
*
* @param show the flag.
*
* @see #getShowZeroHours()
*
* @since 1.0.10
*/
public void setShowZeroHours(boolean show) {
this.showZeroHours = show;
}
/**
* Returns the string that is prepended to the format if the relative time
* is positive.
*
* @return The string (never <code>null</code>).
*
* @see #setPositivePrefix(String)
*
* @since 1.0.10
*/
public String getPositivePrefix() {
return this.positivePrefix;
}
/**
* Sets the string that is prepended to the format if the relative time is
* positive.
*
* @param prefix the prefix (<code>null</code> not permitted).
*
* @see #getPositivePrefix()
*
* @since 1.0.10
*/
public void setPositivePrefix(String prefix) {
if (prefix == null) {
throw new IllegalArgumentException("Null 'prefix' argument.");
}
this.positivePrefix = prefix;
}
/**
* Sets the formatter for the days.
*
* @param formatter the formatter (<code>null</code> not permitted).
*
* @since 1.0.11
*/
public void setDayFormatter(NumberFormat formatter) {
if (formatter == null) {
throw new IllegalArgumentException("Null 'formatter' argument.");
}
this.dayFormatter = formatter;
}
/**
* Returns the string that is appended to the day count.
*
* @return The string.
*
* @see #setDaySuffix(String)
*/
public String getDaySuffix() {
return this.daySuffix;
}
/**
* Sets the string that is appended to the day count.
*
* @param suffix the suffix (<code>null</code> not permitted).
*
* @see #getDaySuffix()
*/
public void setDaySuffix(String suffix) {
if (suffix == null) {
throw new IllegalArgumentException("Null 'suffix' argument.");
}
this.daySuffix = suffix;
}
/**
* Sets the formatter for the hours.
*
* @param formatter the formatter (<code>null</code> not permitted).
*
* @since 1.0.11
*/
public void setHourFormatter(NumberFormat formatter) {
if (formatter == null) {
throw new IllegalArgumentException("Null 'formatter' argument.");
}
this.hourFormatter = formatter;
}
/**
* Returns the string that is appended to the hour count.
*
* @return The string.
*
* @see #setHourSuffix(String)
*/
public String getHourSuffix() {
return this.hourSuffix;
}
/**
* Sets the string that is appended to the hour count.
*
* @param suffix the suffix (<code>null</code> not permitted).
*
* @see #getHourSuffix()
*/
public void setHourSuffix(String suffix) {
if (suffix == null) {
throw new IllegalArgumentException("Null 'suffix' argument.");
}
this.hourSuffix = suffix;
}
/**
* Sets the formatter for the minutes.
*
* @param formatter the formatter (<code>null</code> not permitted).
*
* @since 1.0.11
*/
public void setMinuteFormatter(NumberFormat formatter) {
if (formatter == null) {
throw new IllegalArgumentException("Null 'formatter' argument.");
}
this.minuteFormatter = formatter;
}
/**
* Returns the string that is appended to the minute count.
*
* @return The string.
*
* @see #setMinuteSuffix(String)
*/
public String getMinuteSuffix() {
return this.minuteSuffix;
}
/**
* Sets the string that is appended to the minute count.
*
* @param suffix the suffix (<code>null</code> not permitted).
*
* @see #getMinuteSuffix()
*/
public void setMinuteSuffix(String suffix) {
if (suffix == null) {
throw new IllegalArgumentException("Null 'suffix' argument.");
}
this.minuteSuffix = suffix;
}
/**
* Returns the string that is appended to the second count.
*
* @return The string.
*
* @see #setSecondSuffix(String)
*/
public String getSecondSuffix() {
return this.secondSuffix;
}
/**
* Sets the string that is appended to the second count.
*
* @param suffix the suffix (<code>null</code> not permitted).
*
* @see #getSecondSuffix()
*/
public void setSecondSuffix(String suffix) {
if (suffix == null) {
throw new IllegalArgumentException("Null 'suffix' argument.");
}
this.secondSuffix = suffix;
}
/**
* Sets the formatter for the seconds and milliseconds.
*
* @param formatter the formatter (<code>null</code> not permitted).
*/
public void setSecondFormatter(NumberFormat formatter) {
if (formatter == null) {
throw new IllegalArgumentException("Null 'formatter' argument.");
}
this.secondFormatter = formatter;
}
/**
* Formats the given date as the amount of elapsed time (relative to the
* base date specified in the constructor).
*
* @param date the date.
* @param toAppendTo the string buffer.
* @param fieldPosition the field position.
*
* @return The formatted date.
*/
public StringBuffer format(Date date, StringBuffer toAppendTo,
FieldPosition fieldPosition) {
long currentMillis = date.getTime();
long elapsed = currentMillis - this.baseMillis;
String signPrefix;
if (elapsed < 0) {
elapsed *= -1L;
signPrefix = "-";
}
else {
signPrefix = this.positivePrefix;
}
long days = elapsed / MILLISECONDS_IN_ONE_DAY;
elapsed = elapsed - (days * MILLISECONDS_IN_ONE_DAY);
long hours = elapsed / MILLISECONDS_IN_ONE_HOUR;
elapsed = elapsed - (hours * MILLISECONDS_IN_ONE_HOUR);
long minutes = elapsed / 60000L;
elapsed = elapsed - (minutes * 60000L);
double seconds = elapsed / 1000.0;
toAppendTo.append(signPrefix);
if (days != 0 || this.showZeroDays) {
toAppendTo.append(this.dayFormatter.format(days) + getDaySuffix());
}
if (hours != 0 || this.showZeroHours) {
toAppendTo.append(this.hourFormatter.format(hours)
+ getHourSuffix());
}
toAppendTo.append(this.minuteFormatter.format(minutes)
+ getMinuteSuffix());
toAppendTo.append(this.secondFormatter.format(seconds)
+ getSecondSuffix());
return toAppendTo;
}
/**
* Parses the given string (not implemented).
*
* @param source the date string.
* @param pos the parse position.
*
* @return <code>null</code>, as this method has not been implemented.
*/
public Date parse(String source, ParsePosition pos) {
return null;
}
/**
* Tests this formatter for equality with an arbitrary object.
*
* @param obj the object (<code>null</code> permitted).
*
* @return A boolean.
*/
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof RelativeDateFormat)) {
return false;
}
if (!super.equals(obj)) {
return false;
}
RelativeDateFormat that = (RelativeDateFormat) obj;
if (this.baseMillis != that.baseMillis) {
return false;
}
if (this.showZeroDays != that.showZeroDays) {
return false;
}
if (this.showZeroHours != that.showZeroHours) {
return false;
}
if (!this.positivePrefix.equals(that.positivePrefix)) {
return false;
}
if (!this.daySuffix.equals(that.daySuffix)) {
return false;
}
if (!this.hourSuffix.equals(that.hourSuffix)) {
return false;
}
if (!this.minuteSuffix.equals(that.minuteSuffix)) {
return false;
}
if (!this.secondSuffix.equals(that.secondSuffix)) {
return false;
}
if (!this.dayFormatter.equals(that.dayFormatter)) {
return false;
}
if (!this.hourFormatter.equals(that.hourFormatter)) {
return false;
}
if (!this.minuteFormatter.equals(that.minuteFormatter)) {
return false;
}
if (!this.secondFormatter.equals(that.secondFormatter)) {
return false;
}
return true;
}
/**
* Returns a hash code for this instance.
*
* @return A hash code.
*/
public int hashCode() {
int result = 193;
result = 37 * result
+ (int) (this.baseMillis ^ (this.baseMillis >>> 32));
result = 37 * result + this.positivePrefix.hashCode();
result = 37 * result + this.daySuffix.hashCode();
result = 37 * result + this.hourSuffix.hashCode();
result = 37 * result + this.minuteSuffix.hashCode();
result = 37 * result + this.secondSuffix.hashCode();
result = 37 * result + this.secondFormatter.hashCode();
return result;
}
/**
* Returns a clone of this instance.
*
* @return A clone.
*/
public Object clone() {
RelativeDateFormat clone = (RelativeDateFormat) super.clone();
clone.dayFormatter = (NumberFormat) this.dayFormatter.clone();
clone.secondFormatter = (NumberFormat) this.secondFormatter.clone();
return clone;
}
/**
* Some test code.
*
* @param args ignored.
*/
public static void main(String[] args) {
GregorianCalendar c0 = new GregorianCalendar(2006, 10, 1, 0, 0, 0);
GregorianCalendar c1 = new GregorianCalendar(2006, 10, 1, 11, 37, 43);
c1.set(Calendar.MILLISECOND, 123);
System.out.println("Default: ");
RelativeDateFormat rdf = new RelativeDateFormat(c0.getTime().getTime());
System.out.println(rdf.format(c1.getTime()));
System.out.println();
System.out.println("Hide milliseconds: ");
rdf.setSecondFormatter(new DecimalFormat("0"));
System.out.println(rdf.format(c1.getTime()));
System.out.println();
System.out.println("Show zero day output: ");
rdf.setShowZeroDays(true);
System.out.println(rdf.format(c1.getTime()));
System.out.println();
System.out.println("Alternative suffixes: ");
rdf.setShowZeroDays(false);
rdf.setDaySuffix(":");
rdf.setHourSuffix(":");
rdf.setMinuteSuffix(":");
rdf.setSecondSuffix("");
System.out.println(rdf.format(c1.getTime()));
System.out.println();
}
}
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